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By Trygve Helgaker, Poul Jorgensen, Jeppe Olsen. Preface xxi Overview xxv Programs used in the preparation of this book xxix 1. Second Quantization 1 1.1 The Fock space 1 1.2 Creation and annihilation operators 2 1.3 Number-conserving operators 6 1.4 The representation of one- and two-electron operators 9 1.5 Products of operators in second quantization 14 1.6 First- and second-quantization operators compared 18 1.7 Density matrices 19 1.8 Commutators and anticommutators 25 1.9 Nonorthogonal spin orbitals 27 2.
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